After each call, network goes to zero for next 1min
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After each call, my Samsung galaxy S advance phone network goes to zero point. I can't make calls during that time... I've to wait each and every time for 30sec and after the network comes 2 or 3 points only, I can make calls. I don't think there is any problem with network (cause I used the same sim in other phones, I didn't have any problem). Please help me with it. I got this S advance phone only 2 weeks before...